/*

 * Licensed to the Apache Software Foundation (ASF) under one

 * or more contributor license agreements.  See the NOTICE file

 * distributed with this work for additional information

 * regarding copyright ownership.  The ASF licenses this file

 * to you under the Apache License, Version 2.0 (the

 * "License"); you may not use this file except in compliance

 * with the License.  You may obtain a copy of the License at

 *

 *     http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

package com.bff.gaia.unified.sdk.extensions.euphoria.core.translate;



import com.bff.gaia.unified.sdk.extensions.euphoria.core.client.accumulators.AccumulatorProvider;

import com.bff.gaia.unified.sdk.extensions.euphoria.core.client.accumulators.Counter;

import com.bff.gaia.unified.sdk.extensions.euphoria.core.client.accumulators.Histogram;

import com.bff.gaia.unified.sdk.extensions.euphoria.core.client.accumulators.Timer;



import java.io.Serializable;



import static java.util.Objects.requireNonNull;



/** Instantiate accumulator provider on the first usage. Thus {@link Serializable}. */

class LazyAccumulatorProvider implements AccumulatorProvider, Serializable {



  private final Factory factory;



  private transient AccumulatorProvider accumulators;



  LazyAccumulatorProvider(Factory factory) {

    this.factory = requireNonNull(factory);

  }



  @Override

  public Counter getCounter(String name) {

    return getAccumulatorProvider().getCounter(name);

  }



  @Override

  public Counter getCounter(String namespace, String name) {

    return getAccumulatorProvider().getCounter(namespace, name);

  }



  @Override

  public Histogram getHistogram(String name) {

    return getAccumulatorProvider().getHistogram(name);

  }



  @Override

  public Histogram getHistogram(String namespace, String name) {

    return getAccumulatorProvider().getHistogram(namespace, name);

  }



  @Override

  public Timer getTimer(String name) {

    return getAccumulatorProvider().getTimer(name);

  }



  private AccumulatorProvider getAccumulatorProvider() {

    if (accumulators == null) {

      accumulators = factory.create();

    }

    return accumulators;

  }

}